Automatic telephone system



March 19,- 1929. c. GILLINGS AUTOMATIC TELEPHONE SYSTEM 5 Sheets-Sheet Original Filed Nqv. 9, 192:5

\w v Q March 19, 1929. c. GILLINGS AUTOMATIC TELEPHONE SYSTEM Original Filed Nov. 9, 1923' 5 Sheets-sheet,

Iii 725 EzZZz c. GILL INGS AUTOMATIC TELEPHONE SYSTEM March 19, 1929.

5 sheets-sheet Original Filed Nov. 9, 1925 I L Q \QQQ NQQ .March 19, 1929. c. G ILLINGS AUTOMATIC TELEPHONE SYSTEM Original Fiied Nov. 9, 1925 5'Sheets-Sheet 4 March19,192'9.' CfGILUNGS 1,705,831

I AUTOMATIC TELEPHONE SYSTEM Original Filed Nov. 9, 1923 5 Sheets-Sheet 5 1 I InuEnZUr 2123:25 5 EzZZm E my: f

Patented Mar. 19, 1929.

umrsn STATES PATENT OFFICE.

oIIAnLEsGi LINGs, or nrvnnroon, ENGLAND, ASSIGNOR, BY MESNE ASSIGNMENTS, To AUTOMATIC ELECTRIC me, or CHICAGO, ILLINOIS, A GORPORATION or DELA- WARE.

Application filed November 9, 1923, Serial This invention relates in general to automatic telephone systems, but more especially to multi-exchange systems; and is an improvement in or modification of that set forth in the 'co-pending application of Richardson et al. Serial No. 547,866, filed March 29, 1922. In that application, a multi-exchange system is described to which the first three letters of the name of the wanted exchange. are dialled to a so called director, which translates them into the series of digits necessary for routing the call to that exchan e.

The register controllers are divided into groups and the first letter dialled is arranged to operate a group selector to pick out an idle register controller of a corresponding group, which then recordsthe two other letters and the subscribers number. In the above mentioned case, an arrangement is described in which a director is released after sending the exchange digits if at that moment the subscriber has not yet started to dial the wanted number, so that the digits subsequently dialled pass direct fromthe calling line' to the wanted exchange. I

The broad general object of the present invention is to provide certain facilities which have been found to be desirable when the system described in the main patent is applied to a large telephone network. In such a network itwill often happen that a number of classes of exchanges are found, differing in size. For instance, it is often the case that all the exchanges are not of 10,000 line capacity and in fact, some of the exchanges may only havea maximum. capacity of 1,000

lines,while others may only have a capacity j of 100 lines. Consequently, in such cases it is not necessary to dial more than two or three series of impulses corresponding to thenuinber of digitsin the number of the wanted party, and one of the features of the present invention relates to the provision of means by which when the necessary twoor three digits have been repeatedrby theregister translating and sending apparatus this apparatus is automatically released.

According to another invention, an arrangement is provided for routing a call to an operators position when an excessive pause occurs after the-first or second and before the third letter of the exchange name has been called.

feature of the present AUToMATIo TELEI'HONE SY TEM.

No. 673,683, and inGreat Britain December lt), 1922. Renewed February 14, 1929.

In certain cases it is advisable to entirely cancel the exchange code. For instance, there maybe exchanges where it is desirable to use access to trunk lines, While other levels are used for connecting up a subscriber'local to the exchange, for instance, if the selector is dialled to any of the first threelevels it may gain access to second selectors and from sec- 0nd selectors to connectors and thence to the Consequently only four I before the sending'a'pparatus is released.

A further feature of the present invention concerns a faulty-sender alarm circuit for informing the exchange attendant when a send er fails to send out impulses;

A still further feature concerns an arrange mer t for delaying the transmission of the exchange digits until all exchange and numerical digits have been dialled, this beingparticularly desirable when the call routed to. an exchange where thereare no call indicator positions and an operator completes the call.

In order that the invention may be clearly understood and readily carried into efiect, a telephone system in accordance with the invention will now be more fully described with reference to the annexed drawings iirwhich: Figures 1-5 lnelusive are circuit diagrams of suflicient of the apparatus used in a complete register translator system to illustrate [the preferred .form'of the invention. These figures "are based on Figures 1-5 'of the above application.

The relay equipment D, first selector E, register'selector or A impulse register F, Fig ure 1, the master digit controller MDS, thousands I register M hundreds register M tens register M units register M Figure 2,

the impulse Sending switch S, Figure 3, and

certain levels of the first selector for giving v .has taken into use the trunk conductors 10,

11, and 12, -1 igure 1 dialled the first three letters of the exchange name and that the Wipers 306-309, inclusive, of the ii and C impulse register J are resting; on bank contacts 500' in known manner. Bank contacts 500 correspond to a three figure exchange and it is therefore necessary to operate the switching relay 112, Fig. 3, immediately the three numerical digits of the wanted partys number are sent i. e when the sequence switch 5' has reached the 8th position that is the wipers are resting on the 3th bank contacts.

' When the exchange code (i. e. the A, B and C digits) has been dialled the wipers 306-309 inclusive, are resting on bank contacts 500. The master digit controller MUS, Fig. 2 is in 3rd position and extends earth over conductor 400, resting contact and armature 507 of relay 508, conductor 511, wiper 404 of sequence switch S in 1st position, conductor 411, wiper 3060f register J, lower bank contact 500, make-before-break contacts controlled by armature 512, numerical digit cutoff relay 513 to battery. Relay 513 energizes in this circuit and closes a locking circuit for itself at armature 512 including conductors 514 and 102, bank contact 91 and test wiper 3Tof theregister selector l Fig. 1, armature 84 and its working contact, armature 74 and its working contact to earth.

When the exchange code translation and the subscribers number have been sent in the manner described in the application hereinbeitore mentioned, the sequence switch S steps to 8th position and the following circuit will be closed for switching relay 112, Fig. 3; earth, armature 515 and its working contact, conductor 516, 3th contact in the bank of wiper 406 of sequence switch S, wiper 406, conductor 420, normally closed contacts controlled by armature 139, switching relay 112 to battery. Relay 112 operates in this circuit and establishes at armature 139 a locking circuit for itself, opens at armature 140 the circuit of relay 107, removes at armature 137 the short circuit from resistance 141, and at 136 disconnects conductor 103 from conductor 202 and connects 103 to earth.

This latter operation completes a circuit for stepping magnet 115.

tact 96, Fig. 1, 38, 83, 73, 62, contact springs controlled by armature 16, relay 13 to bat tery. Relay 13 establishes at 16 a locking circuit for itself, connects at 14 and 13, trunk conductors 10 and 12 with conductors 20 and 22, respectively, and disconnects conductors 10 and 12 from conductors 60 and 61, respectively, at 15 and 17.

An instant after springs 14 and 18 engage their working contacts, the control circuit extending; to the register translator is cut oli', and finally, just before the relay is fully operated, springs lo and 17 disengage their resting contacts. The latter operation disconnects the line relay 64, and completes the switching operation by which the calling subscribers line is connected through to the established connection. When line relay 64 of the register selector F is disconnected from trunk conductors 10 and 12 by relay 13, it breaks at 72 the circuit of slow release relay 65, which at 75 completes a circuit for release magnet 71, which restores the switch F to normal, the circuit of magnet 71 being opened at the oil normal springs when the shaft reaches normal position.

Relay disconnects earth from conductor 76 and from the holding conductor 102. Switching relay 68 and relays 110, 111, 112 and 210 also deenergize. Relay 111 con nects earth at springs 133 and 133 to the upper bank of switch S in order to advance the sequence switch wipers to their normal position, earth being connected to armature 133 as follows: armature 133 conductor 561, resting contact and armature 5430f relay 540 to earth. Belay 111 also connects at armature 132 wiper 113 of switch S with This operation, however, is of no particular importance, ordinarily, owing to the fact that the sending switch is restored automatically by the completion of the same circuit at 116 of relay. 105. Relay 110 connects earth at 130 to release conductor 204, thus completing parallel energizing circuits for release magnet 211 of the master digit controller MDS, release magnet 305 of register J, and the release magnets 220. 221, 222 and 223 of register switches As described in the foregoing, the connection is switched through and the register translator is released as soon as the final series of impulses has been transmitted. The register translator is thus used only during the actual settingnp of the connection and is rendered accessible to other subscribers. As soon as the connection is completed and after the connection has been switched through, it is the same as an ordinary automatic connection.

The method of: switching through to a two figure exchange will now be explained and for this purpose it will be assumed that the exchange code has been dialled and that the wipers 306809 inclusive, have been set on bank contacts 502. Bank contacts 502 correspond to a twofigure'exchange and it is therefore necessary tooperate switching re lay 112 immediately the two numerical digits havebeen sent, i. e., when the sequence switch S has reached the 7th position.

. hen the, wipers 306 308, inclusive, are

resting on bank contact 502, the master digit controller MDS, Fig. 2 is in 3rd position and extends earth over the previously traced circuit to wiper 306 of register J, lower bank contact 502 makebefore-break contacts controlled by armature 517, numerical digit cutoff relay'518 to battery. Relay, 518 operates in this circuit and at armature 517 closes a locking circuit for itself including holding conductors 514; and 102. Relay 518 at armature 519 connects earth over conductor, 520 the 7th contact in the bank of wiper 406 of sequence switch Sf When the exchange code translation and subscribers number have been sent the se-' quence switch S will step to 7th position and the earth on the 7th contact in the bank of wiper4l06 will complete the'previously traced energizing circuit for switching relay 112. Switchingrelays 112 and 13 operate as before described to switch the calling party through and effect the release of the register controller. i It will be seen that the cross connection between the first bank contactof any two or From the, foregoing it will beseenthat an arrangement has been provided whereby two, three and four figure exchange systems in'the same net workare adapted to be controlled from the sameimpulse registering, translating and sending apparatus without it being necessary to prefix the two and three figure exchange numbersby two and one digits V respectively.

A description of the method of routing 'a calling subscriber to an operators position and releasing the register controller for further service should a pause of sufficient duration occur after the first or the firsta-nd second and before'the third letter of the wanted exchangename has been dialled, will now be explained. a

' Referring now to T is mounted on a constantly rotating shaft .which makes one complete lrotation every thirty seconds, and consequently, as soon as i this camearths'conductor 299 a circuit is com- The Figure 2, the timing cam 342- 346 of the IDF, are only typical and "206 as; follows: earthed conductor 299, ar-

mature 209 and its working contact, armature 521 and its resting contact, upper winding of relay 206 to battery. I Relay 206 par tially operates and closes cont-acts 522 only. When the earth has been removed from con ductor 299, relay 206 fully operates in the following circuit: earth, armature 215 and its resting contact, workingcontact and armature 217, armature 522 and its .working contact, upper and lower windings of pick up relay 206 in serles to battery.

Relay 206 upon operating performs the fol' lowing functions:

11 Closes a circuit at armature upper winding ofrelay 205 from earthj'wiper 219 of master digit control'switch MDS in position 1 01:2, conductor 524, armature 523,

upper win ding of relay 205 to battery. This relay, being adjusted softhat the combined energization' of both of its windings is required to operate it, does not operate because its lower winding is disconnected by earth being. removed from conductor 299. p I 2. Prepares the following circuit at, armature 521 for switching relay 112, Fig. 3: armature 521 and its workingcontact, armature 525 and its resting contact, conductor 201, conductor 420, normally closed springscontrolled by armature 139, winding of'slow switching relay 112 to battery.

Relay 206 also prepares at armature 521 and its working contact a circuit for the lower.

After a predeter winding of relay 205. mined time the. timing cam T again. earths conductor 299 and relay 205 energizes and at armature 526 completes the following locking circuit for itself: battery, lower winding of relay 205, armature 526 and its working contact to earthed holding conductor 514. Relay 205upon energizing earths the start lead 511 523 1athe from earth, wiper 219 of master digit control a position, conductor-425, back contact and armature 1 19, armature 140 and its resting contact, impulsing relay 107, interrupter I to battery. The translation now takes place in accordancewlth the cross connections from terminals 34l2-346. Relay 205 also connects the left hand terminals 3 16 34 2, of the IIDF, via conductors 528 -532 working contacts and armatures 53 3, conductors 534' 538, conduc tors 411-415 to contacts 1 to T inclusive in the bank of wiper- 404 of sequence switch 5. cross connections from teri'ninals represent a three figure translation 123.

' Immediately relay 205 operates thecircuit of switchingv relay 112 is broken at armature 525, but in order to ensure tbat'relay 112 does not operate a small. copper slug is placed on terminal S it terminal 3-i5, conductor the armature end of the core. This copper slug momentarily delays theoperation of relay 112.

When the translation has been sent the circuit of switching; relay 112 is completedas follows battery, winding of relay 112, makebetore-break contacts controlled by armature 139, conductor 420, wiper 4.06, conductor 373,

529, armature 533, condiu-tor 537, conductor 41 i, bank contact 4 in the bank oi the wiper i -.0 1 of sequence switch S, wiper 4-041, conductor 511, armature 50? and its restino' contact, conductor 4:00, working contact and arn'iature of relay 205, bank contact 1 or 2 oimaster digit control switch M, wiper 219 to earth.

Switching relays 112 and 13 cause the connection to be switched tl'n'ougrh to the 1st selector E. and the release oi? the register translator for further service.

Should a pause 0t suliicient duration occur after the third letter of the exchange name has been dialled the operation as described in the main patent takes place and relay 205 is not operated as the master d 't control switch is in 3rd position and therefore only 'one winding of the relay 205 is energized.

The small copper slur, on relay 112 momentarily delays its operation but in no way interferes with the general operation of the circuit. v i

A description will'now be given of an arrangement whereby the exchange code can be cancelled and the subscribers number only made eitective. The register translator when modified as described below, is made to caneel the exchange code, and to switch the call through to the 1st selector E which then responds to the dialled impulses, thus illustrating that 1st, 2nd or 3rd selectors in a system using register controllers can be made to respond to either exchange codes, as translated, or directly to dialled impulses as required by the trunking scheme.

In cases where it is clear that growth beyond 900 numbers will not be required for a given oiiice, it is possible to operate this etiice with register translator equipment and 1st selectors only. For branch oliic-e working all outgoing trailic is routed over one level or" the 1st selectors say 0. All exchange names are trai'islated in this oiliee so that this is the i digit sent,other dig; is being such as to secure the correct routing of a call in the main otlice. The remaining 9 levels 01. the 1st selector are used for trunks direct to connectors giving 900 numbers. The exchange code when dialled cuts oil the register translator and leaves the call through to the 1st selector which responds directly to impulses from the dial in the usual way. Subscribers numbers in this case consist of the exchange code and 3 digits only, irrespective of the fact that this oiiice is part of a large network. I

An alternative plan provides that both the exchange code and the subseribe1"s number are received by the register tlZiIlSlLilOlQ bllt that the code is cancelled and only the numerical part ofthe subscribers number set out.

Assuming that the exchange code has been dialled and that the wipers 'ot the switch 3 I closes a locking circuit for itselt and causes the switching relay 13 to operate and switch the connection through to the selector E. The register controller is released in the hereinbeitore described manner and subsequent digits dialled operated standard Strowger switches in the usual manner.

A description will now be given of the alternative arrangement in which both the ex change code and subscribers number are received by the register controller, the exchange code being cancelled and the numerical digits being transmitted by the register. For this purpose we assume that the exchange code has been dialled and that the wipers of switch J are set on bank contacts 505 and that the master digit switch is in third position. When wiper 806 of switch J engages the lower bank contact 505 the following circuit is conr pleted for relay 540 battery relay 540, makebetore-break contact-s controlled by armature 5 11, conductor 5 12, lower bank contact 505, wiper 306, conductor 111, and overthe previously traced circuit to wiper 219 of the master digit control switch M in third position and earth. Relay 540 energizes in this circuit and closes the locking circuit "for itself at armature 541. At armature 542 opens the circuit of relay 111 in the sender S which releases and earths at armatures 133 the first three contacts in the bank of wiper 403 of switch S-. Relay 540 at armature 5 13 earths conductors 544; which causes magnet402 ot'sequence switch S to automatically advance to fourth position which is the I position for controlling the numerical di' 'its from the register translator in the usual way.

It will be appreciated that the register translator can translate the exchange code, i. e., the first threeletters of the exchange name, to operate any number of trunking switches from nil to tour, and in addition can store and send subscribers numbers using any number of digits up to tour or can function without subscribersnumbers. Any combination of code and number within these limits being possible.

A description will now be given ot-the 424. which is connected to ea rth. only at exchange digits until all exchange an'dnu- 400 to lead 511 thereby preventing the sender being started due to earth beingplaced on the third contact of master digit control switch 'M. in order to ensure that the starting circiiit will be broken before relay 508 is energized an auxiliary sluggishrelay 510 is connected to the lead 52i-and-therefore maintains zit-509 the connection 'betweenzlead 511 and its starting branch open for. a sufficient time to allow relay-508 to energize andopen the connections at back contact of armature 507. v r I 1 I The front contactoi armaturer507 is con-' nected to lead 550 which is connected to lead the last numerical digit has been registe Consequentlythe starting of the sender over lead 511 is delayed until the last series ofimpulses have been register-i 1 it might happen that ii? a "sender becomes faulty for any reason no impulses are sent out when an alarmshoiild be given to attract the attention of the exchangeattendant as distinct from the attention or an operator in the case of a fault on the part of a 'calli subscriber. p p

For this purpose a second pick up relay 551 2, is provided which iscontrolled in a.

similar manner to pick-up relay 206 whenever relay 210 is energized;

The initial energizing circuit extends vfrom earth onspi-ings of timing cam T, conductor 229, arinat d'iictor 552., armature 553, and its back contact, lower winding of relay551 to battery.

Relay 551 partially energizes and prepares a circuit at its armature 554; through armature 555, conductor 556,:irmature 557,

conductor 558, conductor 511 to armature-507 which is connected either to lead 400 or to lead r 50 according as to whether relay 508 is de-' energized or not. In either case it will he recollected that earth is connected to this armature when the sending is to commence so that relay 551 will fully energize when the earth connection is removed from armature 553 it the conditions are'such that thesender start circuit is incompleted determined by earth connection to armature 507 and the sender has not commenced to send impulses as determined by relay 106. If the sender coinmences to operate relay 106 will energize and allow relay 551 to fall away. If, however, the sending is delayed for half a minute or as re209 and its front contact, con-- determined by the timing cam T a unitwill be completed for-relay 559 -"Wl11Cl1-lOCks energizedand can only he released manually by key 560 and completes a circuit atarmature 562:501' the alarm 568. 7

What is claimed is:

1.1n a telephone system,

register senders including registering mocha nism'to register telephone numbers and send mg mechanism to control switching mechanisn'i' tov complete connections in accordance with "the registered numbers, switchingf mechanism for extending a connection from a calling line to one of said register senders responsive to the dialling of a pics-determined digit, a timing device thereupon effective to cause the sending mechanism of said register" sender to transmit a pre-determined digit. combination at the end of a pre-determined time, and means responsive to furtherldialling by the calling subscriberfor' preventing said timing means from exercising said con trolof the sendinginechanism. a I 2. In a telephone system, a plurality of register sendersincluding registering mechanism to register telephone numbers andsen d iug mechanism to control switching mecha nism to complete connectionsin accordance with the registered numbers, switching mechanism for extending a connection from a calling line to one. of said register. senders,

a timing device thereupon eiiective to cause the sending mechanism ofsaidr'e 'ister sender to transmit a predetermined digit combinationfat' the endof a pre-determined tim'c,'controllingi'neaiis, responsive to further dialling on the part of the calling subscriber toprevent-the said timing means from effectingthe said control of the sending mechanism, and

'meanscontrolled by t'he timing means ren-f dored effective responsive to said .fiii'ther dialling to free the register sender and to.

place theiturther extensionof the connection under thedirect control of the calling sub scriher at the end-of a {ire-determined time.

3. In a telephone system, afplurality oi" register senders including registeringmecl w nisni to register telephone-numbers and sending, mechanism to control switching mechanismto complete connectionsin accordance with the registered numbers, switching mechanism forextending a connection from a calling line to one of said registersenders, a timing device thereupon effective to cause the sending mechanism of saidregistersender to transmit a predeterm1ned digit combination atthe end of a predeterm nedtime,controlling means responsive to further. dialliiig on the part or" the calling subscriber to prevent the said timing means trom'eiiecting the said control of the sending mechanism, and means controlled by the timing means rendered effective responsive to said further dialling to:

freethe register sender and to place the fur ther extension ofthe connection underthe direct control of the calling subscriber at the end of a pre-determined time, said controlling means being responsive to still further dialling to prevent the said operation of the last named means.

41:. In a telephone system, a register sender including two registers and sending mechanism controllable thereby, automatic switching mechanism for extending a calling line to said register sender, other'automatic switching mechanism for subsequently completing the connection to a called line under control of said register sender, delay-action means operative subsequent to the seizure of said register sender to control said sender to transmit a predetermined digit combination, and means operated by the receipt of the impulses transmitted from the calling line to operate the first of said registers to cancel said control of said delay action means over said sender.

5. In a telephone system, a register sender including two registers and sending mechanism controllable thereby, automatic switchingmechanism for extending a calling line to said register sender, other automatic switching mechanisms for subsequently com pleting the connection to a called line under control of said register sender, delay-action means operative subsequent to the seizure of. said register sender to control said sender to transmit a pre-determined digit combination, means for releasing the sender and for placing the further extension of the connections under the direct control of the calling line, and means operated by the receipt of the impulses transmitted from the calling line to operate the first of said registers to cancel said'control of said delay action means over said sender and to place said releasingmeans under the controlot the delay action means.

' 6. In a telephone system,- a register sender, exchanges of different classes, and a relay in said register sender operated responsive to the exchange registering mechanism being set in a certain. position to record the class of the called exchange corresponding to such posi-- tion and to control the sender in transmitting a digit determined by the setting of said register mechanism.

7. In a telephone system, a register sender, exchangesdivided into a-plurality of classes, and a relay in said. register sender common to all the exchanges in a particular class operated responsive to the setting of the exchange registering mechanism into the position assigned to any one of said exchanges of the said particular class to effect a circuit change in the register sender to adapt said register sender to handle calls to that class of exchange, and to control the sender in transmitting one of the digits required to trunk the call to the particular called exchange.

8. a register sender for use in multiexchange telephone systems in which a disexchange, a switching device controlled re-,

sponsive to said register sender being set in certain of said distinct setting positions to alter the time at which the sending operation takes place.

9. In a register sender for use in telephone s, stems in which. a distinct setting position is provided for every exchange in the net work, and in which. retransmission of impulses begins loet'ore the complete number is registered, a switching device operated responsive to said register sender being set into certain ot-said distinct setting positions to make starting of the retransmission of the impulses dependent upon thereceipt of the last digit in the number. 1

1 0. In a register sender for usein telephone systems, means for registering the digits in a telephone number, means for operating the sending mechanism to retransmit digits in accordance with said registration, an alarm circuit, a timing device for closing said circuit, and means responsive to, the operation oi? the sending apparatus in retransmitting digits vtor preventing said timing device from closing the alarm circuit.

11. In a telephone system, a register sen-der including an oiiice register and a plurality of other registers, means for setting said office register into a position corresponding to the oiiice digits of a telephone number and ingdigits in said telephone number, sending mechanism controlled by said office register to transmit digits to trunk the call to the desired ofiice and controlled by said other registers to transmit digits to complete the connections, and means responsive to a particular settingot said ofiice register for canceling said control of said otfice register over the sending 1nechanism.-

12. In a register sender employing a sender controlled in turn by each of a plurality of registers, a control relay connected between a particular setting of one of said registers and said sender, a circuit for energizing it when said one register is set in said particular position, and contacts on said relay for closing a local locking circuit for said relay, and for disconnecting the first named circuit from said relay, and for extending it to said sender, whereby said sender is controlled in the usual manner by said register and said locking circuit doesnot interfere with the subsequent sender operation.

13. In a director, a register, a sender including a counting device, contacts in the bank of said register connected to said countin device, another contact in said bankeirtending a relay, and contacts on said relay for extending said other contact to said counteluding a counting device, contacts'in the bank of said istei connected to said count} ing device, another contact in said bank eXe tending to a rela contacts on said relay for extending said other contact to said counting device, and other contacts on said relay controlling the release of said director. i

15. In a telephone system comprising eX- changes of different sizes and in Which the number of digits in the telephone numbers are not uniform, a director for trunking calls to, said exchanges and to lines therein, calls to each exchange being extended in' accordancennth a different code, director cut off relays, one for each exchange except those exchanges having a maximum ,number of digits in their numbers, and a register contact I assigned to each exchangeior determining a digit of the code and for operating the corresponding cut ofif relay.

16. In a telephone system, twoexchanges, subscribers lines in the second exchange I having more digits intheir telephone nunr bersthan the 111163.111 the otherexchang athird exchange, a director in. the third can change for trunking calls .to either of said first tWo exchanges in accordance with oilice codes and for controlling the completion of much calls in the-exchanges, means for autoinatically releasing said director responsive tothetransinission of theiinal digit in the number of a subscriber: in the second 6X? change, a conductor in said director tor de- 'termining the value ofa code digitinthe first; exchange code, and a relay energized over saidconductor for enabling vsaid director to contacts on said relay, and means controlled through the last named register .contactfor operating said relay to complete the last said connection. Y Y Y 1.8. In a director, a .iregister, asending mechanism including a counting device, a introl relay, a connection from a given con tact in said register to a contact in said sender independent of the contacts 01? said relay, a

connection from a second contact in said register to a contact in said sender through contacts on said relay, means controlled through the last named register contact for oper'ating'said relay to complete the last said connection, and other contacts on said relay to disconnectit from the associated register,

contact. I

19. In a telephone system, automatic switches for connecting a calling and called line, a director tor controlling saidswitches andincluding means for registering the number called, and means in said director responsive to a delayin dialling for-either op-' erating certain of said switches according to a predetermined code or for connecting the calling'line With'theitirst ofsaid switches, de-' pending onWliether the delay occurs before or after a certain definite digit of the number is dialled.

20.111 a telephone system, automatic 7 switchesfor connecting a calling and called line, a director forcontrolling said sw tches? and including nicans'for registe'ing the number called, means in said director responsive to delayin dialling for either operating the director to set one of said switchesindependent of any jregis'trationnr for immediately restoring the director to common use, depending on Whether the delay occurs before or after a certain definite digit of the number is dialled. v

21. In a register sender ior use 7 phone systems, means tor-registering the digits a telephone number, means for operating the sending mechanism to retransmit digits in accordance with said registration,

a time controlled alarm circuit, and means controlled by said sending mechanism While in operation tor opening said alarm circuit.

22in a register sender for use in tele phone systems, means tlor registering the digits in a telephonenumber, a sending mechanism including a counting switch, means for operating said sendingmechanisin'and said counting switch to retransmit digits in accordance with said registration, an alarm cir- .cuit, a timing device for closingsaid alarm circuit, and means operative responsive to said counting switch moving ofi normal-for opening said alarm circuit.

23. Ina telephone system, a registersender including an oflice'register, nieansfor setting said oflice register into aposition coiiresponding to the othce digits of a telephone number,

a step by step sequenceswitclnsending inecl anisni controlled jointly by said oiiice register and said sequence switch to retransmit digits 7 to trunk the call to the desiredofiice, and a relay, said relay operated responsive 'toa particular setting of said ofiice register for:

causing said sequence switch to operate and cancel the control of said oltic'e register over saidsending mechanism. y 24. In a telephone system, a regi's'te sender including an ottice register and a plurality of other registers, means for setting said oitice register into a position corresponding to the ofiice digits of a telephonenumber and for setting said other registers into positions, respectively, corresponding to the remaining digits in said telephone number, a I 'step-by-step sequence switch, sending-inech anism initially controlled ointly by'said of-' fice register and said sequence switch to transin teleion mit digits to trunk the call to the desired otfice and then controlled jointly by said other registers and said sequence switch to transmit digits to complete the connection, a relay, and means for operating said relay responsive to a particular setting of said oiiice register for causing said sending mechanism to start operation under the joint control of said sequence switch and the said other registers. p i

25. In a telephone system, a director comprising means for registering a telephone number and for transmitting a series or digits including both oilice and line selecting digits, a switching device in said director having a position for each oi said digits, means for automatically advancing said device past all the positions which correspond to otiice selecting digits in case a telephone number in a particular ofice is called, and means for preventing the transmission oi any digits while the automatic advance of said device is taking place.

26. In a telephone system, a registerng mechanism for registering the cigits m a telephone number, a sender for retransn'iitting the digits registered on said registering mechanism, a circuit for. starting the opera tion of said sender, means normally cltective to close said circuit when part of the di s oi a telephone number have been regi a relay, and means for operating said rela to prevent the closing of said circuit in case certain digits have been registered on said registering mechanism.

27. In a telephone system, a registering mechanism for reglstering the digits. in a telephone number, a sender iior retransmitting the digits re istered on said registering mechanism, a circuit for starting the operation of said sender, means normally effective to close said circuit when part of the digits of a telephone number have been registered,

, a relay, means for operating said relay to prevent the closing of sa d circuitin case cer tain digits have been registered on said registering mechanism, a second circuit for starting thcoperation of said sender, and means dependent upon the receipt of the last digit in the telephone number for closing said second circuit to start said sender.

28, A register sender tor ise in a telephone system whereinthe digits of a telephone number are registered on a registering mechanism, and in which a sender normally starts to retransmit part of the digits before all of the digits of a telephone number have been registered, characterized in this, that there is means operative for delaying thestarting ot the sender until the registering mechanism receives the last digit of the telephone number in case certain digits are registered on the registering mechanism.

29. In a director, a sender for retransmitting a plurality of digits, a sequence switch having a position for each digit, director cut-oii' means operated in a particular, position of said switch, a relay, and means for operating said relay to control the sender in retransmitting a digit and to cause said cutoff means to operate in a diflerent position oiisaid switch.

30. In a telephone system, a'director, a sender for transmitting a plurality of digits, a sequence switch having a position for each digit, director cut-oii means operated in a particular position of said switch, exchanges of difi erent classes, a relay for each of said classes, and means for operating one of said relays when a call is to be extended to an exchange of one of the classes to control the sender in retransmitting one of the digits to trunk the call to the particular called exchange and to cause said cut-oil means to operate in a difierentpositionot said switch.

31. In a telephone system, adirector, a

sender for transmitting a plurality of digits, 7

a sequence switch having ayposiiton for each digit, director cutoff means operated in a particular position of said switch, exchanges of different classes, a relay for each of said classes, means for operating one of said relays when a call is to be extended to an (no change of one of the classes to control the sender in retransmitting one of the digits to trunk the call to the particular called exchange and to causesaid cut-oil means to operate in a different position of said switch, and means for operating another of said relays when a call is to be extended to an exchange in a different class to control the sender and to cause said cut-oil means to operate in another different position. 7

In witness whereof, I hereunto subscribe my name this twenty-third day of October, A. D., 1923. 

